Autor / Beteiligte

• The Brocken in Harz National Park legendary mountain Karste, G. ; Steingaß, F. ; Sixsmith, Mark 6. Auflage, Wernigerode : Nationalpark Harz, 2014

• Nature experience paths explore and discover - on your own Sixsmith, Mark Wernigerode : Nationalpark Harz, 2015

• Nature experience paths explore and discover - on your own Sixsmith, Mark 2nd edition, Wernigerode : Nationalpark Harz, 2018